Skip,
I just did this last winter on a TR6 that had been sitting for years. The
core plug has likely rusted through and is leaking. As you state you'll
need to remove the carbs, intake, and exhaust manifold. I didn't remove the
water pipe as it looked OK. I stuck a screwdriver through the core plug
where it was leaking and just twisted it out. You may want to be careful and
not push the plug into the block. I cleaned up the hole, put a little
non-hardening gasket sealer on the plug and tapped it in with a wood block
and hammer. This is a great time to clean the carbs, paint the exhaust
manifold, clean the block and paint it.... and on and on:-)
Good luck!
Bruce Harding
68 TR250
80 TR8
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